Answer:4 cm is the length of perpendicular BD. :)
Explanation:
Given,
∡B = 90°.
AB = 10cm.
BC =20cm.
To Find,
The length of the side BD.
Solution,
Given that,
BD is perpendicular to the line AC.
10cm is the side Ab
20cm is the side BC.
In a right-angled triangle,
AC =
AC=
AC =
AC = 22.36cm
AC = cm.
The triangle's area = 1/2 *b*h
1/2*20*10.
And it's equal to
1/2*AC*BD.
When equating both equations.
1/2*20*10 = 1/2 *10 * BD
Therefore,
BD = 100 /11.18
BD = 8.944cm
BD = cm.
Hence, 4 cm is the length of perpendicular BD.